| Re: Problem with sensitivity of a Draw widget (also in XROI.pro) [message #38424] |
Tue, 09 March 2004 03:53  |
helaha
Messages: 26
Registered: March 2004
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Junior Member |
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David Fanning <david@dfanning.com> wrote in message news:<MPG.1ab637c7711868719896f0@news.frii.com>...
> Ahammer Helmut writes:
>
>> I'm working on an interactive widget with several buttons, text and a
>> draw widget for image display, scrolling and curser information. The
>> last thing I implemented was the curser information (with
>> keyword/motion_event). Now the curser position and the grey value of
>> the image are displayed if the curser moves over the image. But now
>> there emerged a problem I had not before. If the scrolling bar is
>> moved with the mouse and after the mouse button is released and if the
>> mouse thereafter is moved instantly over the image display, then the
>> scrolling event is not finished readily. The viewport is not scrolled
>> instantly. The viewport is scrolled step by step and the whole scroll
>> event need much more time (up to 10-20 seconds). It seems that the
>> curser motion events are handled before the scroll event has finished.
>> I used the sensitive keyword, but it didn't help.
>> Furthermore, XROI.pro does the same. I`m using IDL 6.0 with W2k
>
> With XROI I can stop this from happening by turning draw
> widget MOTION events OFF while I process the viewport event
> and then turning them back on. Here is the code I changed:
>
> pro xroi__Viewport, sEvent
>
> compile_opt idl2, hidden
>
> ; Handle viewport move (scroll) event in the draw area.
>
> WIDGET_CONTROL, sEvent.top, GET_UVALUE=pState
> Widget_control,(*pState).wDraw, Draw_Motion_Events=0, /Clear_Events
> ;^^^^^^^^^^^^^^
> draw_geom = WIDGET_INFO((*pState).wDraw, /GEOM)
>
> ; On Motif, the geom.xsize may include room for scrollbar even if
> ; no scrollbar present. Restrict size to <= to the virtual canvas.
> draw_xsize = draw_geom.xsize < draw_geom.draw_xsize
> draw_ysize = draw_geom.ysize < draw_geom.draw_ysize
>
> (*pState).oView->SetProperty, $
> VIEWPLANE_RECT=[sEvent.x, sEvent.y, draw_xsize, draw_ysize]
>
> ; If we know our draw time is long, then set the hourglass.
> if ((*pState).draw_time gt 0.1) then $
> WIDGET_CONTROL, /HOURGLASS
>
> (*pState).oWindow->Draw, (*pState).oView
> Widget_control, (*pState).wDraw, Draw_Motion_Events=1, /Clear_Events
> ;^^^^^^^^^^^^^^
> end
>
>
> Cheers,
>
> David
Thank you very much for your quick response. Your solution works very
well, despite that the scrolling event is sometimes neglected at all.
In my application only the /Clear_events keyword works, the
Draw_Motion_Events settings seem to have no influence on the result.
Best Regards,
Helmut
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